SymptomsNOTE: The issue has been fixed as of Plesk 10.4.
Real memory usage reported by Plesk Health Monitoring Service (Home > Server Health > Memory) does not match the RAM amount reported by the utility "free."
CauseRAM was updated after Parallels Plesk Panel was installed.
Plesk Health Monitor does not detect whether the system configuration is changed after the initial installation.
ResolutionThe problem will be fixed in a future update of Parallels Plesk Panel to be released after version 10.2.
Here is the workaround:
~# /usr/local/psa/bin/sw-engine-pleskrun /usr/local/psa/admin/plib/scripts/setup-health-monitor.php